Electrocardiogram (ECG) Monitoring
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Questions and Answers

What is the order of magnitude of the voltage produced between ECG leads due to the largest action potentials in the body?

  • 100mV
  • 0.1mV
  • 1mV (correct)
  • 10mV

    • How are the action potentials in the heart measured externally?

  • Using external electrodes (correct)
  • Through ultrasound imaging
  • By measuring temperature changes
  • By analyzing blood samples

    • What do the measurable voltages at the skin resulting from heart action potentials represent?

  • Measurement of blood pressure changes
  • Direct measurement of body-produced voltages (correct)
  • Representation of skin sensitivity
  • Indirect measurement of muscle contractions

    • Which area of the heart can act as a pacemaker if the SA node and AV node are not working?

    <p>His-Purkinje cells</p> Signup and view all the answers

    At what rate do the His-Purkinje cells normally contract?

    <p>30-50 bpm</p> Signup and view all the answers

    If the SA node is not working, which area of the heart will act as the pacemaker?

    <p>AV node</p> Signup and view all the answers

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